[cfe-users] Adding linker flag `-save-temps` resolves the clang-8 error: "unable to make temporary file"

[David Blaikie via cfe-users]

Oh, sorry, I didn't read the question in detail about how -save-temps
was making things work when they otherwise were not.

If you run clang with -### it'll show the command lines it's using,
which should show you where it's trying to write the files so you can
change that/make them writable. I'm not sure which variable is used to
influence clang's temporary directory choice, though.

On Thu, Aug 13, 2020 at 11:22 AM Danijel DOMAZET
<p-danijel.domazet at devialet.com> wrote:
>
> Thanks Fang-rui.
> I still haven't been able to fix the issue, I still use --save-temps, and that makes linking very slow.
> Why does this error go away when I set --save-temps, any idea??
>
>
>
> On Thu, Aug 13, 2020 at 7:16 PM Fāng-ruì Sòng <maskray at google.com> wrote:
>>
>> On Thu, Aug 13, 2020 at 8:59 AM David Blaikie <dblaikie at gmail.com> wrote:
>> >
>> > On Thu, Aug 13, 2020 at 2:59 AM Danijel DOMAZET
>> > <p-danijel.domazet at devialet.com> wrote:
>> > >
>> > > Thanks David.
>> > > Why do you think this could be about current dir?
>> > > Isn't it about TMP (or TEMP or TMPDIR) environment variables?
>>
>> Neither the driver option -save-temps nor the linker option
>> --save-temps (driver option -Wl,--save-temps) respects
>> TMP/TEMP/TMPDIR.
>> The temporary files are saved relative to the current working
>> directory, which can be changed via -working-directory=
>>
>> > Because I ran it locally, and observed that that's where the files
>> > were written to.
>> >
>> > >
>> > > Thanks,
>> > > Danijel Domazet
>> > >
>> > >
>> > > On Thu, Aug 13, 2020 at 12:11 AM David Blaikie <dblaikie at gmail.com> wrote:
>> > >>
>> > >> Looks like it writes the files to the current directory - do you have
>> > >> permission to access the current directory?
>> > >>
>> > >> On Wed, Aug 12, 2020 at 6:28 AM Danijel DOMAZET via cfe-users
>> > >> <cfe-users at lists.llvm.org> wrote:
>> > >> >
>> > >> > Hi clang users,
>> > >> > I am using Windows10 + Cygwin + Eclipse +  LLVM toolchain to build a C/C++
>> > >> > project.
>> > >> >
>> > >> > The files compile fine, but linking with `clang++` fails with multiple
>> > >> > `error: unable to make temporary file: No such file or directory`.
>> > >> >
>> > >> >     clang++ -o test "source1.bc" "source2.bc" "source3.bc"
>> > >> >     clang-8: error: unable to make temporary file: No such file or directory
>> > >> >     clang-8: error: unable to make temporary file: No such file or directory
>> > >> >     clang-8: error: unable to make temporary file: No such file or directory
>> > >> >
>> > >> > Linker generates one error per each object file.
>> > >> >
>> > >> > However, when I add the `-save-temps` option to linker, it works OK.
>> > >> >
>> > >> > I am launching Eclipse.exe from within Cygwin. I have tried to set TMP,
>> > >> > TEMP to /temp, /temp/, /cygdrive/c/temp, etc, but nothing worked.
>> > >> >
>> > >> > What could be the problem?
>> > >> >
>> > >> > Thanks,
>> > >> > Danijel Domazet
>> > >> >
>> > >> >
>> > >> >
>> > >> > - Confidential -
>> > >> > _______________________________________________
>> > >> > cfe-users mailing list
>> > >> > cfe-users at lists.llvm.org
>> > >> > https://lists.llvm.org/cgi-bin/mailman/listinfo/cfe-users
>> > >
>> > >
>> > > - Confidential -
>>
>>
>>
>> --
>> 宋方睿
>
>
> - Confidential -